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Green Building Bible, Fourth Edition
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Housing - Renovation: How to sound insulate between two flats

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    I have a problem with 2 ground floor flats with a dividing wall of 9” brick. There is a common attic which has 200mm of glass wool on the ceilings as insulation and a standard stud wall stuffed with insulation above the dividing wall in the attic.

    The problem is noise transmission between the flats.

    The stud wall in the attic was put in as a precursor to giving one of the flats a loft conversion. Putting in the stud wall made no difference to the sound transmission so the assumption is that the sound transmission is through the dividing wall on the ground floor rather than up through the ceiling across the attic and down to the next flat. The floors of both flats are concrete on earth and the external walls are 500mm stone / rubble walls.

    What would be the best way to sound insulate the dividing wall without losing too much space and without needing a second mortgage. Preferably with any work being done from one side only.
    • CommentAuthorArtiglio
    • CommentTime5 days ago
     
    An effective solution is to strip the plasterboard from one side of the existing wall, then build another decoupled stud wall parallel to that 50mm plus separation, glass fibre or similar , plasterboard on one face. ( soundblock/ db board if possible)
    However it means you are losing 7 inches or so from the room and electrics/ plumbing need moving. But is very effective.
    • CommentAuthormarktime
    • CommentTime4 days ago
     
    I resolved a similar problem where you could hear inaudible conversations from the other side by fitting plasterboard on metal battens screwed directly to the wall and stuffing between them with rockwool batts. Stopped the noise but can't vouch for the science.
    • CommentAuthorrevor
    • CommentTime4 days ago
     
    I believe there is a soundproofing membrane that can be stuck to the wall and decorated over. Don't know the name just heard about it. Think it is based on an EPDM/rubber type material. It gets away from building an extra wall.
    • CommentAuthorrevor
    • CommentTime4 days ago
     
    Just google this.

    soundproofing membrane for walls

    Lots of sites come up
    • CommentAuthorrevor
    • CommentTime4 days ago
     
    See robust detail in building regs E dealing with flats is covered in there that might be useful to you.

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